Efficient charge transfer at a homogeneously distributed (NH4)2Mo3S13/WSe2 heterojunction for solar hydrogen evolution

Farabi Bozheyev, Fanxing Xi, Paul Plate, Thomas Dittrich, Sebastian Fiechter, Klaus Ellmer

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Highly (00.1)-textured polycrystalline WSe2 films are developed as hydrogen evolving photoelectrodes and improved through deposition of a thin ammonium thiomolybdate (NH4)2Mo3S13 catalyst film. This semiconducting thiomolybdate forms a heterojunction with the p-type WSe2 film passivating recombination centers of excited electron-hole pairs at the edges of the (00.1) textured WSe2 nanoflakes. In addition, thiomolybdate acts as a photoelectrocatalyst at the electrode-aqueous electrolyte interface during light-driven hydrogen evolution. Whereas the photoelectrochemical activity of pure WSe2 is dominated by charge carrier recombination processes at edge states of the hexagonal nanoflakes, we obtain homogeneous charge transfer across the van der Waals planes concomitant with the passivation of these edge states. A photocurrent density of up to 5.6 mA cm-2 at 0 V vs. RHE is obtained with the proposed homogeneously distributed (NH4)2Mo3S13/WSe2 heterojunction system under AM 1.5 illumination in the 0.5 M H2SO4 electrolyte. We conclude that homogeneously distributed semiconducting catalysts on the van der Waals planes of WSe2 nano-crystallites are a feasible strategy towards solar hydrogen evolution with large-area photoelectrocathodes.

Original languageEnglish
Pages (from-to)10769-10780
Number of pages12
JournalJournal of Materials Chemistry A
Volume7
Issue number17
DOIs
Publication statusPublished - Jan 1 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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